Goodwill and Other Intangible Assets - Goodwill and other intangible assets rollforward (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill
Goodwill, beginning of period	$ 1,213,524
Goodwill, foreign currency translation	4,532
Goodwill, end of period	1,218,056
Intangible assets with an indefinite life
Intangible assets with an indefinite life, beginning of period	682,779
Indefinite-lived intangible assets, foreign currency translation	3,626
Intangible assets with an indefinite life, end of period	686,405
Intangible assets with a definite life
Intangible assets with a definite life, beginning of period	307,350
Amortization	(5,588)
Identified definite life intangible assets, foreign currency translation	2,389
Intangible assets with a definite life, end of period	304,151
Total
Goodwill and other intangible assets, beginning of period	2,203,653
Amortization	(5,588)
Foreign currency translation	10,547
Goodwill and other intangible assets, end of period	$ 2,208,612